<script src="https://unpkg.com/vue"></script>

<div id="app">
  <p>{{ message }}</p>
  <p v-once>{{ message }}</p>
  <div v-html='html'></div>
</div>

<script>
  var vm = new Vue({
    el: '#app',
    data: {
      message: 'Hello Vue.js!',
      html: '<h3>hello world</h3>'
    }
  });

</script>
